The Guardian says the Royal Navy's new multi billion pound submarine, HMS Astute, has been beset by design and construction flaws that have raised doubts about its performance and potential safety. Full story >>
VOCABULARY
A sub is tha same as a submarine, a ship that can travel both on the surface of the water and under water. • The last time a Russian sub was detected close to the United States was in 2009, according to defense officials.
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